package com.chen.regie.controller;


import com.chen.regie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //files是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件回自动删除
        log.info(file.toString());

//        //原始文件名
//        String originalFIlename = file.getOriginalFilename();
        //原始文件名
        String originalFIlename = file.getOriginalFilename();//.jpg
        String suffix = originalFIlename.substring(originalFIlename.lastIndexOf("."));

        //使用UUID重新生成文件名，防止文件名重复造成文件覆盖
        String filename = UUID.randomUUID().toString() + suffix;

        //创建目录
        File dir = new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()){
            //目录不存，在需要创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + filename) );
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);
    }

    @GetMapping("/download")
    public void download(String name , HttpServletResponse response){
        //输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件协会列朗琪，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpge");

            int len = 0;
            byte[] bytes = new byte[1024];
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
